. Orthodontia, or malposition of the human teeth; its prevention and remedy . rds altered as requiredby means of the ordinary clasp-bending pliers. The con-struction of the lower plate is substantially the same, butthe wires lie against the plate in a continuous smooth curve,instead of being corrugated. Figs. 46 and 47 represent an upper and lower expansion plate as cases whereexpansion is notneeded, but simplythe moving of oneor more teeth, uses a solidrubber plate withwires so placed asto produce the de-sired constructionof this for m ofplate is the same
. Orthodontia, or malposition of the human teeth; its prevention and remedy . rds altered as requiredby means of the ordinary clasp-bending pliers. The con-struction of the lower plate is substantially the same, butthe wires lie against the plate in a continuous smooth curve,instead of being corrugated. Figs. 46 and 47 represent an upper and lower expansion plate as cases whereexpansion is notneeded, but simplythe moving of oneor more teeth, uses a solidrubber plate withwires so placed asto produce the de-sired constructionof this for m ofplate is the sameas those just de-scribed, with theexception of theshape and arrange-ment of the wiresand the non-sepa-ration of the single long piece of wire, bent at right angles near oneend and flattened at the other, is embedded at its flattenedend into the plate, while the other end, and a long portionbesides is free and lies in close contact wdth the plate. Be-fore the wire is attached to the wax base-plate, the plastertooth representing the one to be moved should be cut away. Coffins Expansion Plates. 110 ORTHODONTIA. close to its neck and the bent end of the wire laid upon itso as to cover the entire diameter of the stub tooth. In thisposition it is vulcanized to the plate. When the plate is introduced, the wire will have to bedrawn back with an instrument or string before the platewill go into position. Once in place and the wire releasedcontinuous pressure will be exerted on the mal|)osed the tension of .the wire has been lessened by the movingof the tooth, it may be increased either by bending the wirewhere it enters the plate or by cutting it out and re-settingin a different position. Another and very convenient way of lengthening thewires to follow the moving tooth, is to slip a section of plati-num or German silver tubing over the end of the wire andsoft-solder it in position. Where a tooth is to be pressed outward the wire is anchoredin the palatal jDortion of
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidorthodontiaormal00guil
